Method for industrialized reparing cyclopentene

Abstract

An industrial process for preparing cyclopentene features use of cyclopentadiene as raw material, alcohol as solvent and metal Ni as catalyst, and includes selective hydrogenation by molecular hydrogen, and rectifying to separate cyclopentene from cyclopentane as by-product and solvent. Its advantages are high purity (98%) and selectivity (95%) and no environmental pollution.

Description

technical field

[0001] The invention belongs to the technical field of medicine and pesticide fine chemical industry, and relates to an industrial-scale preparation method of cyclopentene. Background technique

[0002] Cyclopentene is an important pharmaceutical and pesticide intermediate. The use of cyclopentene as a copolymerization component of polymers can change the elasticity of copolymerized polymers. The addition of cyclopentene and hydrogen halide to generate halocyclopentane is a key intermediate of pesticides, and its polyhalogenated products are also used in the production of pesticides and medicines. In recent years, medical disinfectants have gradually been replaced by glutaraldehydes from phenols, and the most economical synthesis method of glutaraldehyde is prepared by oxidation of cyclopentene with hydrogen peroxide. There are many preparation methods for cyclopentadiene, such as cyclopentanol is prepared by hydrogenation of cyclopentanone, and cyclopenten...